\begin{table}[tbhp] \centering {\begin{tabular}{l*{5}{c}}
\hline
                    &\multicolumn{1}{c}{2002}&\multicolumn{1}{c}{2003}&\multicolumn{1}{c}{2004}&\multicolumn{1}{c}{2005}&\multicolumn{1}{c}{2006}\\
\hline
a11 last month hours worked&       164.3&       163.7&       167.8&       165.1&       177.8\\
                    &     (58.16)&     (56.78)&     (56.21)&     (60.34)&     (69.02)\\
 \hline
\hline
\end{tabular} } \end{table} 
